Ok, so my cam syncronizer failed on my 2000 F150 4.2L, so I replaced it. The only problem is that while the old squeaky syncro was timed perfectly at 54 degrees, the new one will not line up to the 54 degree reference mark. Its weird, I can take the new one out, and put the old one in, with no problems it lines up fine, but as soon as I put the new one back in, it will not line up. And yes I do have the special install tool, and I believe the engine is at TDC(I put the install tool on the old one as I was removing it, just to make sure it was at tdc, and it IS on the compression stroke. I have no idea what is happening, but if have tried getting it as close as I can several times, which is close, because it idles fine, but stumbles under load.

Oh yeah, I have also even tried taking the new syncro back to ford and exchanging it for another new one, but the second new one had the same problem....

Any help would be GREATLY appreciated,

Thanks!

 

I would go and find all of your timing marks. There is a mark on the crank pulley that will line up with a mark on the block when the engine is at #1 cyl TDC, then make sure the rest of the timing marks line up.
It sounds like you are rolling the the chain back one tooth when you are installing the new sychro. Make sure you have the slack in the chain on the correct side of the synchro, I am guessing the old one is worn and allows more slack than the new one, one side of the chain should be tight and all the slack on the other side of the sychro if the slack is on the wrong side it retards the timing.

 

Perhaps you have the wrong sensor?? Misboxed perhaps?

 

He brought the first one back and the second one did the same thing. I know from experience that you cannot check your timing mark to many times. If the crank is off tdc by 5 degrees thats about 1 tooth on the syncro. The easiest way to time the engine is to line up the crank and lock it there so it cannot move, then line up the timing marks on the timing gear and get that chain on making sure all of the slack in the chain is on the tensioner side of the gear, then go back and check the timing marks on the crank and timing gear again, then line up the cams and put their chains on again making sure ALL of the slack is on the tensioner side, check the timing marks again and then spin the engine by hand about 20 times to make sure nothing is binding. You can time the engine in the reverse order but it will take lots of luck.

 

i agree with lastsplash you can never check your timing enough and like he said to spin the motor over by hand to make sure everything is good it does sound like you are off by like a tooth for it to idle fine

 

hi, if you are having further problems with your 4,2 v6 try the v6 forum brian is a good help. with my 97 v6 all done ok with the timing marks using the tool. bokker.

 

Well if the original goes in, the new one should too!!